SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118389bfdac5a36bae630d66dd9770aa9cef014d5b27eefafb5cdf31e7e254b8' 
  AND token = 'RRKjPCjPFBO/lPNg9jDLyqmwJvjV4vuhDBXX0geQtog=' 
  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"
    }
  }
}