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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7d7d9f1c30c87e630a038384c35ca4262ccf2b0309a09761d11b67421c8d6147' 
  AND token = 'Qr1pfn6c269w/6uo8eLoUt70GJER0I28v7QloReUUqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00783

JSON explain

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