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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d68429661390d847f8d03054a7245bc643768d1db5d3fba65ae5470dbce190f' 
  AND token = 'zFlr9Azth6tGdIeueHqAludkSyz14H8LXG65MD8rHzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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