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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84aaae874a029a4e4435f66141a06593a036f115489d67671eafb52b3b9ce483' 
  AND token = '2FpdqV3+HzA8Op3f6QSXXFtspb0sCWCTKxH+I6c7KFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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