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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444d1f49a37591a885b9348e90d866089fb0d103aaeab8f2eb984e8a7abf61c1' 
  AND token = 'LqsRQRgAM5H71T7FBL4hj7qENFLNq8ZWjJ0KnqRV95Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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