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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db4193a69e33ceb1470d4b7e20fc4efacbd032462a7d7be6da32079c5e32fbf' 
  AND token = 'oW2GHwrMfi5LGiviTWjWOqR9i2iXO7E1F1CElgXBm6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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