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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9599ebfa9a34c3125af89b8d1a496bc8d0a39aac6be2e53ff8b31cc1286d6b9d' 
  AND token = '2uWaY479QhDO/dprdQVP7/PMwlNqKrwfbT+ohhNGmmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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