Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949ae759c02851c8d045962e62a05d4c47ef757750b7e79b3d59d769773715fe' 
  AND token = 'JM3HX7f3VVYcRzMYH3vrDTk7EbrNBasRp1/u1n0oO6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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