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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3910878dde10dafdcb631fa89868277d232cfe2707da274b63f64ef724d0f112' 
  AND token = 'wCRPXkFYJ8gzuev02I7l8gzhS5ktqIdoVn/Ga57hQpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00763

JSON explain

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