Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e284c382e81049742d925751ca0f3dab92689bf9b11b2c49431fec35e725ac' 
  AND token = '37yg85TiIqe4mSEcjjG76ZYhGWMCR1e0bVb1fJu1i3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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