SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd88453723459172320e0557ae38a8244baf6370b4bf79655e4d4b06d9b3d854' 
  AND token = 'rxxmC/tp/90P/8+KQWH63fjGpWSqqfBPL3YUkL1ugBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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