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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3b6ba282a32e2d4d0511f8d4751a92525e13b6b2746f9606e677fe56310434' 
  AND token = 'mlKeUD00wM5W/ulZ0CtTTYadOHliAu1WqJLPkJidgCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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