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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'de2db82d699a18ae8b3d8babb53d2b3c170e0da8dc2c108bc2c01709f30f887d' 
  AND token = '49Mo9X6+WPROfgquAhz1g4yILMWNUjBSuo+Z4q2Nalo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00787

JSON explain

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