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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '84ae0489d5799c32879bf964912f2560aec2e25261e8dd0928b2c0e9712a435e' 
  AND token = 'F2xfPzx8xR/fdwPWeqWEAbZY2ExPyIEIYjnFgx5DMsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00761

JSON explain

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