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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df937ffc1dfabdcf135a720dc090d442cfa5a121ff7e1f07ae81df1ef9d5168' 
  AND token = 'uUeCzvRSDSqnhbYBwDF/mE/yclK6QaOtNL6obS37RZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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