Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcb7be3736aad2833115fdec30a894c3c33f451a3f6159e9ed2b1783d113dcd' 
  AND token = 'npx9dISfGqLBLpi9rdqOxMWc+nLcR6J2D8mwdvx+CSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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