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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6f72c1d591bb32b1f45a4c11445555a87be7b9ce421dd04096a82e055fabae65' 
  AND token = 'AFaUW87QlYTzQ05F9mY9xlX9zLs1eFjbs5dbE/0xDYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01503

JSON explain

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