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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '999efae962fae63a1adcac813e19149a70e409783647a3686318b6f35e20f04d' 
  AND token = 'VkgI3qF6PX98/7F/W8Wzys7brKRnVla1Z3Le7GraFjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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