SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea3d4964fb2b8c40a8bc0a45f36793a24591ebfa7f751a812c612b8085f2eec' 
  AND token = 'Smv8wVL65CJTMtJVTlioFYyvMhXzqVu82EB5YdzABcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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