SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e39e664124aedfa2ab9abc63c46122e6ad5f7362e3fc9e5d4993d150b1eb48' 
  AND token = 'yi/TsuIsp0Y2Bk3vmaGzgGSo2JO3WLQvw/QVPSnKVGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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