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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65112731bb6f1e5055b529af3d88ba9feb535825192efee360eb725bd0a364cf' 
  AND token = 'W7iy047chWpkR+aoM+5NSU/ZtXk5Le7lqvIcuaLA4mY=' 
  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"
    }
  }
}