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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '77f6745227bf5057ae15c71b4b019f29673ef56faf8f20dd6fa585121821574b' 
  AND token = 'DVQmFPEbVItDYTrSJobrLJNVQvtMVayWdol0cORfDIw=' 
  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"
    }
  }
}