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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ded3393d676657170d5ced21dcacf988e795077d5e146b918f5d0bc3c1c33084' 
  AND token = 'gPv1Zj9JuyMlGcPAQ46kA+cAKqCQD0ODrbUeZ4a0eus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00851

JSON explain

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