SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7a4fc2bd4ac376f96aaf08675b68936c13c40ab2e023cad93211225ba53cd2' 
  AND token = 'CGSKMNqS/wo3Yp42Cgu4o0t+9miWhvS49FTBYC+lPWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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