Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae842c708fda3cdcfa7feca0fab4c30d0a309fe077e4c18cf2f233b6c3d8634' 
  AND token = 'Rr6Oi1KeyQ58OrWKlLrskVFWeIyzs60HUf1KmHcHuBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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