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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae09801a44ecee5adb27784408ba7c53a3a64aaa3a3257fb9356a9fc17c5305' 
  AND token = 'owT4zgIEnGvYF05uoJi4tv4dRb+uxoZN/AtS5HqZy7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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