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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f0501c4ac6d2d9b51bb1cbd79f8519bd5dd915f0cdb5941860e9d973b69a19bb' 
  AND token = '3WcrXrj2y1yOLn9F3DwLDhK7TDPfobC1AgG+eAuGyfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00836

JSON explain

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