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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8a7853fc04ffb092586a75e2c6a1c0c5733b5a38b563313bad677856615327b2' 
  AND token = '1QS59329DGA0574whKEg/rH5DX9TXm3i5V1MjG57GHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00882

JSON explain

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