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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fd96b65fbf64921869a1bc732caf2e43fbf6e0273ca73ed5b2a829d03f7523' 
  AND token = '9qj6UG5AyTNhnpniZcRVIxWCP6Zcx1F1bM9G6SdS9rc=' 
  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"
    }
  }
}