SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22fd18806bbe8cdee4e38fa51139e5332ae1d8aba297faede730969849b8c685' 
  AND token = 'r03u/FFKwZXSjYTl7sfu+CQYvl+UGVX+nm9kxr8WUTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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