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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a4c82b6c8050cdc306d3624329c4e500e720c2301d70e70a76466b3e98591d' 
  AND token = 'nxy0yFTv51VxiAVdqP9ucPTdn/M7thd6gq575+qbYZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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