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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abe0218f69e1e1ec4a697404dd8f275eee39b9f562d8c79cc55e97b1fb6e551' 
  AND token = 'KXRpR0XHFhK/HtrW2Jdevvg5MDAVM3s/zFlWWDAba3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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