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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98c6a2c54a28d269e458ecbd7ea09d9817e7d91ddb3e63fce3cbd20b439f4c7' 
  AND token = 'SmjPyYX4WuJrsMOvMVf7RqB4zzHAJTIa5zfBWkejZRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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