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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6c698141a4b934e6af99f568cae469232d4bdb2b2e498c429d9114f3858459' 
  AND token = 'YFVKfaPW2r5a4jNvh5591eZd/WVgIF3QDUoxXB3Ypok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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