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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9a7bcd52c42bbbcdb3ecfe11caf58dbc7ee0914b94dc48627af02435793f9ca' 
  AND token = '3gbir2JKck3fpYTtFojTyI7SZCitvFc+NsuplcoSYIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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