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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7449c66b7903b5467f1bceeb76b93b01b4e847503af9ae0921b56f03022845' 
  AND token = 'C/Q4ZvzkVBJW994vkYN7vUis2YNT+OtI3ptnnT6Gxyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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