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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ab29a283e2606d18597722dccf1089258dacd9cd0456e890b1cd141427a176' 
  AND token = 'VnO77/mq/sA3XBzm8FcHmVJxsXPbEyB3sLeNb5PKg0o=' 
  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"
    }
  }
}