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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1110bdfbded0a55def0ce38afb27b224026c39b6a22d1329f8558e2065eda5fa' 
  AND token = 'E73wzETLrSnIU7gVAxU01s6/6vHSg/71MHoNWXpw7RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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