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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '19ea4d0df35c8c4df3c47a1256b188a0d9625b662f6f3336865d881ba05d3700' 
  AND token = '0MfN+2jOmTrH1XJU0+BoJlfhY43/N8F3ooVAzy+i6vM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00961

JSON explain

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