Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e729705c9fccd3ac53011d72c8258de576330f8e52644eeabcfdc1080762003' 
  AND token = '/ysuaDRBEHn4dGZN2eBd73i2oNWTccAYRP5Z2SN6SF0=' 
  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"
    }
  }
}