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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a712171fdcf9b8b852fb76603ff4ca04e42da69c58dcb64c68765ae70200ccd' 
  AND token = 'bbfYvCO2FbV8xcY1DHA5Niw6qy16oDkls6UmddHyB64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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