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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c527e75c9d328d6f9c553883a3fbb66929f89d0b9e15c3bc0144d12a5384c24' 
  AND token = '82pBpb3EQWhx7V55AFZ9QXY3tdLr2t7TIOei4zp/9L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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