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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'baba87519848f91aefe19183ab2455308b0de474ea97dff9396e5aeb2547221c' 
  AND token = 'sSTQKEgP/xg4g7PEpEXeCLc87FN6uGbjXJHOcmvYotY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00763

JSON explain

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