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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c1c67da1e14c069bb8a57a4afb6dfeccdd10d3498e61699759fb51be342fdd8b' 
  AND token = 'j1avxGQQo4I9+arQXYtDxN/BtKFjPETdQQWxHE2xE+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01458

JSON explain

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