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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ae700a4f1e0a37cd3bbc62e514df28d40a33907646e951889bb1b921c8f622' 
  AND token = 'CKqkRrWRNXKgZ5Zi21B9C3bBwBcQ1f9itCALUOCfPpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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