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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ff2597bd378a3a3eb17c0b9b7ea75a4a08ef429ee02c811f93d4fe0cdcb623ca' 
  AND token = 'b/Urr1/4C4YYQpVLJES+aEPU288Fg/roMiGv+NSx7dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00746

JSON explain

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