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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e917c3f640a224c5f0d89e4c7d3be2f96426e1b47f4b8c079b909156fd628b3' 
  AND token = 'U9t9FC5DuI6R3oF9F6O+/psZOLEQ++Uir0Ir70WoZ8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}