SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e2b287f6838d4ac92730a0675df5801aa167d2a3c5c2413cb6857dd7c517a9fe' 
  AND token = '4p5+5d3OzbCR+b8q/Iz/UhyEfhZOXuSStnax9vHOBQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00861

JSON explain

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