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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '03c6183732eaa27e4a33d06ddaf6fd057d02d032837a4e095679149919deeb29' 
  AND token = 'lpnXYdy4zxceqs4Z3dJmHTYPld2Vz0j7jgRK17q+tMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00794

JSON explain

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