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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '37f6fcc774e0154c6c641141924576f5dd6eb63cf1badd1e4d9652878e8f8b8a' 
  AND token = 'iAMjvYB1I6kLnMka6TUpKOwXsp46et6s9J2QkZka6KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00776

JSON explain

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