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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1c6b0f7af43a0de0975a70c1910083480f283f9345333e784365b7f9a675f666' 
  AND token = 'LxGPpFo5l2iYyhmc867oGgFHh7Cvz+y5co0rCWMi95A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00846

JSON explain

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