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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d748c86b545d593e4beeb71da2f1f89785367199a129cd88ce1485dd92d06e' 
  AND token = '3E7wwGwXRltFYbI5MOlEUXiqtb66W575cOV37PC1TWg=' 
  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"
    }
  }
}