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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79c98bc4cafbe28b5c587ae88549effb062e1411e55450f93a5bff571f1c46e' 
  AND token = 'IkW6xfD3uE/r4QXbiR0JVWUp6lzS8WCfQ76PSuZQcvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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