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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8b55b12f9a9191d25ea4d5429464180eca9bf02307dcc99412d1a3ae5d9b3c51' 
  AND token = 'j+LI/qorpBStG3G8knHs093kakbjuuqaSoFzrO0X9Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00868

JSON explain

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