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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '397ad3909f6eb4c3dd638d59a96bae505750459ddd711fdb414320eb249c9367' 
  AND token = 'OohkznpWT/FTMPCPjvPfUcYYlJmTLpa5tuj50G5sQ1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01467

JSON explain

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