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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5605927333bbb6f08bc410dcc232ddb03c377455f86b26eb921d9f5a329807' 
  AND token = 'N+3bin2PqJ4lV35+kf7bI4XFD6luXwvVySocKzFIJ4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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