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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6204f818aa87df37e14fb6ffa07c5a5eb9208249c65235c149885b9ad098bb1' 
  AND token = 'fAMX6AQ1PCvOQot2Y0eb7BS+rG3uDrEY3ZuABgPciUU=' 
  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"
    }
  }
}