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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '38d54ba9e88f683238394d6cb15f5d83ce1877a96e858e93743e6cca35329524' 
  AND token = 'OblbN3iZ2tbbsdf7Nl4F+mMG/z5tTY99KEPYiITTunk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00911

JSON explain

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