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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7d2f90f24c6ed68d7792314c813d903d1fe1b6c03ab08bef04765dd55b70aa92' 
  AND token = 'LEGXyzJbczMSRnGOG7hqpO+mfJka6hp5vh1GgW2uby4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00753

JSON explain

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