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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '705c01d26633f048b3b598aec6d723ad127d9d50d8ee33e64ae5817766451217' 
  AND token = 'Sz0t3T57VP7lKWSZKVMKTGC8SM3kaSVGYdfjWSC89H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00861

JSON explain

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