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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750630ac5850c4f0d5e3180f0942f0e22e6ebf21b053f378c9b4f33adedbe897' 
  AND token = 'FU5boqvJoL85v4cB2ujWfpV4aQcB7/uQr87RlJX6o7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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