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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f07149c47a121f1b8959de4508aeaf0849ccd7aa90393622e8fc2577ed827b9b' 
  AND token = 'TtjkHsdlS9KxhisQ+m4UMUtdq1G0BRGydvMQviTLHpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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