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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '62409a69bffa8179487da378c0df55581270168effe67ddb5855ae7042777fe8' 
  AND token = 'FcoJzdjecqPsvz+z7TSRsN2uwuz0eMyMWGDd96qKutE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00784

JSON explain

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