SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd33e8585382a97ae7af812248ee7481c5eb9988aa4bf81b3f61fec63f6fff6d9' 
  AND token = 'MZrAXIsggt3odvYqFnghrmVwVWW9QbNjCAKr+3mYAgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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