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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5a7f8b672f7df9f6453e297d88d9bdd0a7e7d13d4c6e4cf05a0027d8d8bb2983' 
  AND token = 'WsjXtAxZHZlIlnXEFOejtFPfWEbf7AKR/7EyDG1rg/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00798

JSON explain

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