SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6066d7e22fbb32bba3a572d3c9c17cfd1be5401dd69992416913100848d1938c' 
  AND token = 'FCpzFtv8EsJXsP1+7KdNLcCa9oRWl5GjQZzsgJp6aIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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