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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30718f0bbf9d2cc2d73a4faf94e2c6da452e865f638651c8abaa57e635d90033' 
  AND token = 'R782dnQx9uzGu9Boa9xMGmX+pr6na7iWW0YWGGw/etM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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