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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc1a7b135df9d7b42ebba301dd0fea209835fb561cfe24e0b51e9170c99b5de' 
  AND token = 'FoRJja2WAmZg5wgtCCUGDNAV2JWDnG5T5iTcAFcFHn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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