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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6d78a386e725dc574a47aae8e6858f65e8cbc155f8d3614220d0872082b7d4f6' 
  AND token = 'rYGlS2XMWKSYiKUjkGNykVC0ikI1aT4aTWMVz5R5kFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00824

JSON explain

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