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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4d1dbc08dd04ef22cb5c9f300506c9a3653b573ca2bac0a0343ac38e47a2e8d' 
  AND token = '3gqBU/+kuoQX4AJK70z0ERL/7uM8zsofrIkJf8rwRq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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