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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c44c2862dd45168dfad80df4ee1b941b4ad92d30df83fba07fd1f57921b3afb4' 
  AND token = '1B3a+9R/nQ4nJfrHygDYeavhV3RdveRVWpdMPsgjVuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00777

JSON explain

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