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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88dd0af6b5fedaf1115582ae8e23da1d44f4a75a3edfeafd2de751a48079cd6f' 
  AND token = 'YI13Tniq21erqmtuiYjptSTfeuEMY5dvIwKPhf8cZrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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