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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '18d302766a3f90e3649a5ec376622f233c16ae1464cb87237c5e0ed7042f3274' 
  AND token = 'qmjABe3cAR1LAzbd4UZjxZrZtsyZ/ssgWkgsee28SVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00794

JSON explain

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