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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2ca9395c4383375e4f8c383b1bb153a86aaeda0af3887891ed355a71e453a281' 
  AND token = 'l1+XN7p6FHo97vPrENcjK6RyYq8Bf14YdctkjYbnc6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00815

JSON explain

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