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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d34139a8872fba010b6c356aa7537d9b5687047b39ed8fd73d24e853c1dab9' 
  AND token = 'WyoQNxA5DlL/7XAcZ/s/TbSV505nc2ylUZ57knbXYqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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