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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2bb5ce63afda9830af52b211938ac01ca848bc78cad837225bc4d500f5718133' 
  AND token = '86ZasJ1lEERQ66JLRRhGKk5HwzM3vA2TD+XFvXGPJtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00870

JSON explain

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