SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b42dbf7b9d4807869aed7839bc3af2a89a8f6b9e652323d11cd7294b07ed6d' 
  AND token = 'Pp6q1Pwc+vK5Ug/GZWtU5NJUp5sC0BxYFbWlZRgtzxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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