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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07af7dd9abae2920dbd24c36a7ddf17d616e4f729055ec12bb00a5e23a5e9ba6' 
  AND token = 'tTt3gK+0qD9Y2XPhrLgucYhiUWhyF5pelCau0j293Hg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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